Oh no! Shawn, I'm so sorry. How terribly sad you must be.
Doing a 50% water change sounds like a good idea. For the world of me I can't figure out why your trates are up like this. You are using a fuge with macro, right?
What type of tang did you buy? I'm only asking because if I were to start over, I'd add a tang last. Remember the spotted Kole tang I added to help me battle my hair algae? Well, he was a HUGE help all right, he tore it down like there was no tomorrow, but he is THE most aggressive fish in my tank. He thinks he's Mr. Uber-boss, which ticks me off often enough.
Hopefully someone experienced will jump in and help you figure out how to keep the nitrates down.
Keep you head up, too, please.
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Wendy